Reproduction of the color-temperature scale by photometric methods

Conclusions

Tests have shown that the errors of reproducing the temperature scale on the SPK equipment are related to the following phenomena:

• 1. Instability of the photoelectric portion of the equipment (noise effects).

• 2. Incomplete elimination of differences between the two channels of the external optical system (in comparing lamps).

• 3. Instability of the lamp ribbon brightness (effects of the slope, room temperature, etc.).

• 4. Nonuniformity of the lamp ribbon temperature over the working region.

• 5. Inaccurate knowledge of the effective wavelength.

Above values of the error will be made more precise with further improvements in the equipment and technique of testing.